Restoring a Jailbroken 1.1.2

Since installing oktoprep on 1.1.1 seems to do something that allows it to be available in 1.1.2, does that mean that once you've installed oktoprep it is never able to go back to a truly factory restored state?

I'm wondering if Update leaves oktoprep on it so you can jailbreak but Restore would wipe it off thus enabling you to wipe all traces of a jailbreak. If this is correct it seems that Apple could do a Restore before updating you to the next version (1.1.3) to ensure that nobody has something such as oktoprep installed after an update. Granted that would erase your Ipod, but if they back it up in Itunes first or put it in a disclaimer it wouldn't be a huge issue for them.

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